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Summary of Significant Accounting Policies (Details Narrative) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jul. 31, 2013
Accounting Policies [Abstract]        
Maximum FDIC insured amount $ 250,000us-gaap_CashFDICInsuredAmount      
Uninsured deposits 556,451us-gaap_CashUninsuredAmount      
Provision for foreclosed asset losses 0us-gaap_ProvisionForOtherLosses 0us-gaap_ProvisionForOtherLosses 320,000us-gaap_ProvisionForOtherLosses  
Bank owned life insurance policies 5,104,173us-gaap_BankOwnedLifeInsurance 4,980,390us-gaap_BankOwnedLifeInsurance    
Bank owned life insurance policies, stockholders equity, percentage 14.90%SGB_BankOwnedLifeInsurancePoliciesStockholdersEquityPercentage 15.90%SGB_BankOwnedLifeInsurancePoliciesStockholdersEquityPercentage    
Commercial mortgage banking services 68,000,000us-gaap_FeesAndCommissionsMortgageBanking      
Advertising expense 161,994us-gaap_AdvertisingExpense 180,505us-gaap_AdvertisingExpense 164,518us-gaap_AdvertisingExpense  
Total consolidated assets       $ 500,000,000us-gaap_RegulatoryAssets
Minimum requirement of common equity Tier 1 risk-based capital ratio 4.50%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets      
Tier 1 risk-based capital ratio 6.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets      
Previous minimum requirement of tier 1 risk-based capital ratio 4.00%us-gaap_ExcessCapitalToRiskWeightedAssets      
Minimum requirement of total risk-based capital ratio 8.00%us-gaap_CapitalToRiskWeightedAssets      
Minimum requirement of tier 1 leverage ratio 4.00%us-gaap_ExcessTierOneRiskBasedCapitalToRiskWeightedAssets